NVIDIA dGPU opencv+gstreamer 硬件编解码，RTSP推拉流

 因项目需求，需要在RTX系列显卡，使用opencv+gstremer实现显卡硬件编解码，对解码视频处理之后，在通过硬件编解码推流，然后可以通过vlc拉流观看，其代码如下：

开发系统ubuntu18.04需要安装opencv ，gstreamer,rtsp-simple-server

一、opencv 编译安装gstreamer:

把boostdesc_bgm.i.zip压缩包解压到目录opencv_contrib/modules/xfeatures2d/src/下

1.安装依赖库
sudo apt-get install build-essential
sudo apt-get install cmake git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev
sudo apt-get install python-dev python-numpy libtbb2 libtbb-dev libjpeg-dev libpng-dev libtiff-dev libjasper-dev libdc1394-22-dev
sudo apt-get install libxvidcore-dev libx264-dev # 处理视频所需的包
sudo apt-get install libatlas-base-dev gfortran # 优化opencv功能
sudo apt-get install ffmpeg
其中安装libjasper-dev时可能会报错:
E: Unable to locate package libjasper-dev

解决方法：
sudo add-apt-repository "deb http://security.ubuntu.com/ubuntu xenial-security main"
sudo apt update
sudo apt install libjasper1 libjasper-dev